Is the joke that it looks like it says !sded which goes to "is ded- is dead" so they are saying the dog is dead? I don't see how it's top comment worthy and why they couldn't just say it's dead if that's what it means.

Considering he didn't put you're, but rather you'r it seems to have been a typo. None the less let's dig into your sentence now.

um it's just your not you'r the word "your" is already showing ownership and therefor needs no apostrophe if you were to use an apostrophe it'd be in the world "you're meaning you are"

the more you know!!
Uhm, it's just your, not you'r. The word "your" shows ownership and therefor doesn't need an apstrophe. If you did use an apostrophe the word should be "you're" as in "you are an asshole for correcting this kid".
The more you know!

Among the first pups I can recall from mine childhood, 5 were German Shepherds. Son, that there is a pretty dog. And my view of it has no bearing on the breed of Shepherds. They are wonderful dogs, but that dog is THE prettiest dog I've ever seen in my small, insignificant life.